Selective stacking for pedestal post insulators



Jan. 11, 1966 1. B. OWENS ETAL 3,229,031

SELEGTIVE STACKING FOR PEDESTAL POST INSULATORS 2 Sheets-Sheet l Filed July 2o, 1961 H6712@ 200K KEJJ..

/7 75 /77ar 775 L /7 74 INVENTRJ1 JAW/.EJ 6. UME/VJ BY Sr/fn E/vr, P2556, ff i fafa-EM ,y fram/75 United States Patent Ofitice 3,229,031 Patented Jan. 11, 1966 3,229,031 SELECTIVE STACKING FOR PEDESTAL POST INSULATORS James B. Owens, Greensburg, Pa., and David E. Alexander, Rochester, N.Y., assignors to I-T-E Circuit Breaker Company, Philadelphia, Pa., a corporation of Pennsylvania Filed July 20, 1961, Ser. No. 125,448 4 Claims. (Cl. 174-150) YOur invention relates to pedestal station post insulators and, more particularly, is directed to a novel arrangement whereby two basic pedestal station post insulators can be selectively stacked to obtain a range of basic insulation levels between 200 kv. and 750 kv.

In the prior art construction, it has always been essential to provide three and more basic insulator constructions of the station post insulator type in order to obtain a range of basic insulation levels (BIL) between 200 kv. and 750 kv. However, in our invention we have provided an arrangement whereby two basic insulators, each having similar dimensions of porcelain body and each having the same bolt circle and, particularly, each having a cap and pedestal arrangement, are provided in an 18 and 221/2 height so that these two unitscan be selectively used and combined to obtain discreet hasic insulation levels of 200, 250, 450, 550, 650 and 750 kv. and thereby comply with all of the basic technical regulations of the National Electrical Manufactures Association.

Accordingly, a primary object of our invention is to provide a iirst and second pedestal station post insulator which are substantially identical to each other except for height and are so `constructed that they can be selectively used and combined in a stacking arrangement to obtain basic insulation levels (BIL) ranging from 200 to 750 kv.

Another object of ourinvention is to provide a simplied stacking arrangement for pedestal station post insulators in which discreet steps of basic insulation levels of 200, 250, 450, 550, 650 and 750 kv. can be obtained by selectively stacking combination of only a iirst and a second insulator.

These and other objects of my invention will become more apparent when considered in connection with the drawings, in which:

FIGURE l is a partial cross-sectional view of a typical station post insulator of our invention and shows the cap and pedestal arrangement used in connection therewith.

FIGURES 2a, 2b, 2c, 2d, 2e and 2f areschematic illustrations showing the manner in which the first and second statio-n post insulator can be selectively combined and a plurality of stacking arrangements to provide basic insulation levels ranging between 200 and 750 kv.

FIGURE 3 is a chart arrangement showing the electrical and dimensional ratings of the various stacking arrangements of FIGURES 2a through 2f.

FIGURE 4 is a chart of the mechanical ratings for the plurality of stacking arrangements of FIGURES 2a through 2f.

In FIGURE 1 we have illustrated the general configuration of both the first and the second pedestal station post insulator. It it is noted that each insulator is composed of a porcelain body 10, which porcelain body can be made of any material well known in the electrical industry for high voltage insulators but is preferably made of an alumina body, such as described in United States copending application, Serial No. 104,050, iled April 19, 1961 to Arem Fo-ti and David E. Alexander, entitled Alumina Porcelain Insulators for Electrical Apparatus and assigned to the assignee of the instant invention. The outer skirts of the porcelain body have a diameter of approximately 81/2". The station post insulator is provided with hardware comprised of the upper cap 11 and the lower pedestal 12, each having a 3 bolt circle with places for four bolts so that when the units are stacked one on top of the other, a bo-lt can be passed through each of the four openings 13 in the lower pedestal 12.

The insulator located below has an upper cap 11 with four tapped holes 14 in register with the four openings 13. Thus, the bolts can be placed in threaded engagement with the tap openings 14. A more detailed description of the cap and pedestal arrangement for the station post insulator is described and illustrated in United States copending application, Serial No. 129,481 tiled August 4, 1961 to Arem Foti and W. B. Kelly, entitled Hardware for Station Post Insulators and assigned to the assignee of the instant inventio-n, now abandoned. In this copending application, it is noted that the bolt circles for the pedestal station post insulators can be 3 bolt circles and in the preferred embodiment of my invention, the first and second station post insulators each have a 3" bolt circle.

In the illustration of the various drawings, the iirst insulator is identified as a 1774 insulator and the dimension L of FIGURE 1 is 18". The second insulator is identified as 1775 and the dimension L is 221/2. That is, the over-all height of the first insulator is 18" and the over-all height of the second insulator is 221/2". Other than this difference in height, the two insulators are substantially identical.

A comparison of FIGURE 2a through 2f, along with their corresponding notations illustrated in FIGURES 3 and 4, are used to show the various selective stacking arrangements that can be used along with the characteristics and features that can be obtained thereby. For example, the rst insulator 1774 has a basic insulation level of 200 kv. and the second insulator 1775 has a basic insulation level of 250 kv. In order to obtain a basic insulation level of 450 kv., two iirst insulators are stacked one on top of the other, as illustrated in FIGURE 2c, thus having an over-all height of 36". For a basic insulation level of 550 kv., two of the second insulators 1775 would be stacked one on top of another, as illustrated in FIGURE 2a', for an over-all height of 45". In order to obtain a basic insulation `level of 650 kv., three of the first insulators 1774 would be stacked together as illustrated in FIG- URE 2e for an over-all height of 54". For a basic insulation of 750 kv., stack two of the second insulators 1775 and one of the first insulators 1774 together as illustrated in FIGURE 2f for an over-all height of 63".

Thus, with cap and Vpedestal arrangement for the first and second pedestal station post insulator 1774 and 1775, it is possible to obtain basic insulation levels ranging from 200 to 750 kv. and also obtain discreet step arrangements of 200, 250, 450, 550, 650 and 750 kv. Thus, for example, the insulator 1774 has a cantilever strength of 4500 pounds for both cap `and pedestal mounting and the insulator 1775 has a cantilever strength of 3500 pounds for both cap and pedestal mounting with a minimum amount of insulation and hardware material. Thus, by only providing two basic insulators, namely, the first insulator 1774 and second insulator 1775, it is possible to make maximum use of the given dimensions in order to provide a maximum safety with a minimum amount of material and space.

The details of the various electrical dimensional and mechanical ratings and characteristics are best seen in the charts of FIGURES 3 and 4 which are related to FIG- URES 2a through 2f and it can be seen that maximum efficiency is obtained with our novel invention which requires only a first and second pedestal station post insulator .to selectively obtain a plurality of stacking ar- 3 rangement or basic insulation levels between 200 and 750 kv.

In the foregoing, we have described our invention only in connection with preferred embodiments thereof. Many variations and modifications of the principles of our invention within the scope of the description herein are obvious. Accordingly, we prefer to be bound not by the speciic disclosure herein but only by the appending claims.

We claim:

1. A stacked insulator assembly comprising two station post insulators, ea-ch of said station post insulators having a hollow alum-ina porcelain body with a cap at one end and a pedestal at the other end; each of said station post insulators having an overall height of 18" and a plurality of skirts each having a diameter of 81/2; each of said caps having tapped holes and each of said pedestals having openings to permit stacking of said station post insulators; said tapped holes and said openings, respectively, each being on a three inch bolt circle and receiving bolts, with the bolts passing through the openings and entering into the tapped holes of adjacently stacked insulators, to form said stacked insulator assembly; each of said station post insulators hav-ing a basic insulation level of 200 kv., and a cantilever strength of at least 4,500 pounds, said stacked assembly having a basic insulation level of 450 kv.

2. A stacked insulator lassembly comprising three station post insulators, each of said station post insulators having a hollow alumina porcelain body with a cap at one end and a pedestal at the other end; each of said station post insulators having an overall height ofy 18" anda plurality of skirts each having a diameter of 81/2; each of said caps having tapped holes and each of said pedestals having openings to permit stacking of said station post insulators; said tapped holes and said openings, respectively, each being on a three inch bolt circle and receiving bolts, with the lbolts passing through the openings, and entering into the tapped holesk of adjacently stacked insulators, to form said stacked insulator assembly; each of said station post insulators having a basic insulation level of 200 kv., and a cantilever strength of at least 4,500 pounds, said stacked assembly having a basic insulation level of 650 kv.

3. A stacked insulator assembly comprising two station post insulators, each of said station post insulators having a hollow alu-mina porcelain body with a cap at one end and a pedestal at the other end; each of said station post insulators having an overall height of 221/2 x and a plurali-ty of skirts each having ya diameter of 81/2; each of said caps having tapped holes and each of said pedestals having openings to permit stacking ofV said station post insulators; said tapped holes and said openings, respectively, each being on a three inch bolt circle and receiving bolts, with the bolts passing through the openings, and entering into the tapped holes of adjacently stacked insulators, to form said stacked insulator assembly; each of said station post insulators having a basic insulation level of 250 kv. and a cantilever strength of at least 3500 pounds, said stacked assembly having a basic insulator level of 550 kv.

4. A irst station post insulator having a hollow alumina porcelain body with a cap at one end and a pedestal Iat the other end; said station post insulator having -an overall height of 18" and a plurality of skirts each having a diameter of 81/2"; said cap having tapped holes and said pedestal having openings to permit stacking of said station post insulator; said tapped holes and said openings, respectively, being on a three inch bolt circle to receive bolts; said station post insulator having a basic` insulation level of 200 kv. and a cantilever strength of at least 4,500 pounds; a second station post insulator having a hollow .alumina porcelain body with a cap at one end and a pedestal at the other end; said station post insulator having an overall height of 221/2 and a plurality of skirts each having a diameter of 81/2, said cap having tapped holes and said pedestal having openings t-o permit stacking of said station post insulator; said tapped holes and said open-ings, respectively, each being on -a three inch bolt circle to receive bolts; said station post insulator having a basic insulation level of 250 kv. and a cantilever strength of .at least 3,500 pounds; one of said rst station post insulators and two of said second station post insulators being stacked to obtain a basic insulation level of 750 kv.

References Cited bythe Examiner UNITEDv STATES PATENTS 2,234,391 3/1941 Taylor.

FOREIGN PATENTS 229,972 8/ 1960 Australia.

OTHER REFERENCES Pinoo Insulators, Catalog No. 49, published by the Porcelain Insulator Corporation of Lima, N.Y; copyright i949, pages 112, 113, 122 and 123.

Insulator .and Electrical Equipment, Catalog No. 28, published by Ohio Brass Co. of Mansfield, Ohio, copyright 1953, pages 106, 108, 118 and 119.

JOHN F. BURNS, Primary Examiner.

BENNETT G. MILLER', `IOHN P. WILDMAN, LARA- MIE E. ASKIN, E. JAMES SAX, Examiners. 

1. A STACKED INSULATOR ASSEMBLY COMPRISING TO STATION POST INSULATORS, EACH OF SAID STATION POST INSULATORS HAVING A HOLLOW ALUMINA PORCELAIN BODY WITH A CAP AT HAVING A HOLLOW ALUMINA PORCELAIN BODY WITH A CAP AT ONE END AND A PEDESTAL AT THE OTHER END; EACH OF SAID STATION POST INSULATORS HAVING AN OVERALL HEIGHT OF 18" AND A PLURALITY OF SKIRTS EACH HAVING A DIAMETER OF 81/2"; EACH OF SAID CAPS HAVING TAPPED HOLES AND EACH OF SAID PEDESTALS HAVING OPENINGS TO PERMIT STACKING OF SAID STATION POST INSULATORS; SAID TAPPED HOLES AND SAID OPENINGS, RESPECTIVELY, EACH BEING ON A THREE INCH BOLT CIRCLE AND RECEIVING BOLTS, WITH THE BOLTS PASSING THROUGH THE OPENINGS AND ENTERING INTO THE TAPPED HOLES OF ADJACENTLY STACKED INSULATORS, TO FORM SAID STACKED INSULATOR ASSEMBLY; EACH OF SAID STATION POST INSULATORS HAVING A BASIC INSULATION LEVEL OF 200 KV., AND A CANTILEVER STRENGTH OF AT LEAST 4,500 POUNDS, SAID STACKED ASSEMBLY HAVING A BASIC INSULATION LEVEL OF 450KV. 